Sample/draft short descriptions:
III. Microfluidics: Electrokinetic and Interfacial phenomena
Workshop Organizers: Martin Bazant (MIT), Sandip Ghosal (Northwestern), Ali Nadim
(Claremont Graduate University), Todd Squires (UCSB), Susan Muller (Berkeley).
Short description: Microfluidics is the science of fluid motion on microscopic scales
(roughly 0.1 to a 100 micron). In this regime inertial effects are negligible and interfacial
effects (surface tension, capillarity, electrostatic charge etc.) dominate. The subject has
emerged as an area of great interest in the applied sciences because of potential applications
in nanotechnology and bio-analytical chemistry. The workshop will focus on topics in the
basic science of ionic fluids: zeta potentials, Debye Layers, Electroosmosis and
Electrophoresis; interfacial effects and applications such as controlled droplet motion by
electrowetting, and the Brownian hydrodynamics of macromolecules and polymers. Several
tutorials prior to the workshop will be arranged to give non-specialists the necessary
introductory background.
V. Transport & Mixing in Complex and Turbulent Flows
Workshop Organizers: Peter Constantin (Chicago), Charlie Doering (Michigan), Peter
Kramer (RPI), Dave Sharp (Los Alamos), Bill Young (Scripps Institute of Oceanography).
Short description: Enhanced mixing and momentum transport properties are distinguishing
characteristics of both turbulence and more structured complex flows. The concepts of eddy
diffusion and eddy viscosity were introduced as attempts to “parameterize” these effects to
produce reduced models for both theoretical analysis and simulations. At the same time
turbulent mixing and transport is the focus of significant attention from a fundamental point
of view, based in some cases on the Navier-Stokes equations and in other cases on models
or special flows amenable to more thorough analytical investigations. This workshop is
concerned with modern mathematical approaches to the study of transport and mixing in
turbulence and other complex flows, including transitional flows, along with significant
attention to applications from the applied sciences, predominantly geophysics. Preworkshop tutorials will cover basic models and analysis in turbulence and mixing.
Sample/draft complete descriptions:
III. Microfluidics: Electrokinetic and Interfacial phenomena
Workshop Organizers: Martin Bazant (MIT), Sandip Ghosal (Northwestern), Susan
Muller (Berkeley), Ali Nadim (Claremont Graduate University), Todd Squires (UCSB).
Date: Late Fall 2009
Description: Microfluidics is the science of fluid motion on microscopic scales (roughly
0.1 to a 100 micron). On these scales, the fluid motion is dominated by interfacial effects
such as surface tension, capillarity and electrostatic charge. Length scales are small
enough for inertial effects to be negligible (the Stokes flow regime) and yet not so small
as to invalidate the continuum description, though in some instances Brownian motion
must be accounted for. Many examples of microfluidic systems exist in the living world:
locomotion of micro-organisms, the flow of fluids through the proboscis of insects such
as mosquitos, the behavior of charged colloidal particles, macromolecules and polymers
in ionic solutions and so on. In the world of technology, the subject of microfluidics has
recently been the focus of much attention because of possible applications in
nanotechnology and bio-analytical chemistry. It has been realized that enormous gains in
speed and efficiency are possible if some of the large scale automated laboratory
procedures (such as those involved in DNA sequencing) can be miniaturized and
implemented on palm sized glass or plastic chips. Microfluidics is the essential science
for the design of such "Lab on Chip" devices. Further, the mechanics of charged
macromolecules in solution could be the key to understanding many essential processes
in the biology of living cells..
The topics to be considered include: the basic science of ionic fluids -- zeta potentials,
Debye Layers and ionic transport. The fluid mechanics of Electroosmosis and
Electrophoresis, Induced Charge Electroosmosis (ICEO) and Dielectrophoresis. Statics
and Dynamics of Liquid Drops -- Thermocapillarity, Electrowetting on Dielectric and
applications. Microfluidic processes: the problem of mixing and the problem of
separation. Electrically charged fluids with a free surface -- the Rayleigh instability,
Taylor Cones and Electrojets. Suspension mechanics -- hydrodynamic interactions
between particles and polymers, charge effects and the effect of shear.
We expect to have several introductory lectures prior to the workshop, dealing with basic
fluid dynamics in microfluidic systems. During the workshop there will be three or four
lectures per day on related topics, a continuing poster display, and day's end summary
discussions.
Potential participants (random order):
Ehud Yariv (Technion)
Juan Santiago (Stanford)
Terry Conlisk (Ohio State)
Shelley Anna/ Howard Stone (Harvard)
Michael Brenner (Harvard)
Patrick Doyle (MIT)
Jean-Louis Viovy (Institut Curie)
Gary Slater (U. Ottawa)
Kevin Dorfmann (Minnesota)
Justin Cooper-White (U. Queensland)
Gareth McKinley (MIT)
Eric Shaqfeh (Stanford)
David Saintillain (UIUC)
Tony Ladd (Florida)
Adam Cohen (Harvard)
Eric Weeks (Emory)
Jim Gilchrist (Lehigh)
Michael Graham (Wisconsin-Madison)
Steven Quake (Stanford)
Rustem Ismagilov (U. Chicago)
George (Bud) Homsy (UCSB)
Satish Kumar (UCSB)
Steve Wereley (Purdue)
Armand Ajdari (Saint Gobain)
Robert H. Austin (Princeton)
Harold Craighead (Cornell)
Ulrich Tallarek (Magdeburg/Marburg)
Brian Storey (Olin College)
Todd Thorsen (MIT)
Henrik Bruus (Danish Technical University)
Jongyoon Han (MIT)
Narayan Aluru (UIUC)
Antonio Ramos (Seville)
Mehmet Toner (Harvard Medical School)
Daniel Irinia (Harvard Medical School)
James Sterling (Keck Graduate Institute)
H. Chia Chang (Notre Dame)
Paul Steen (Cornell)
Michael Miksis (Northwestern)
Chang-Jin "CJ" Kim (UCLA)
Klavs Jensen (MIT)
Peter Gascoyne (MD Anderson Cancer Center)
Richard Fair (Duke)
Thomas Jones (Rochester)
Frieder Mugele (Twente)
Ali Borhan (Penn State)
Neil Gershenfeld (MIT)
John T. McDevitt (Texas)
Ming Wu (Berkeley)
David Quere (ESPCI)
Yves Fouillet (LETI, Grenoble)
Neelesh Patankar (Northwestern)
Abraham Lee (UCI)
Kamran Mohseni (Colorado)
Jonathan Rothstein (Amherst)
Eric Lauga (UCSD)
Haim Bau (Penn)
Tom Mason (UCLA)
Dieter Braun (Ludwig Maximialns Universitat)
Charles Schroeder (UIUC)
Patrick Tabeling (ESPCI, Paris)'
Thomas Burg (MIT, postdoc of Scott Manalis)
Derek Stein (Brown)
Sumita Pennathur (UCSB)
Potential Tutorials:
Martin Bazant & Todd Squires, Nonlinear Electrokinetics
Brian Storey, Electrohydrodynamic Instabilities in Microfluidics
Sandip Ghosal, Fundamentals of Electrokinetic Flows
Ali Nadim/ Jim Sterling/CJ Kim/Richard Fair, Electrowetting
David Quere, Capillarity
Tom Jones, Electromechanics
Mike Miksis, Contact Line Motion
V. Transport & Mixing in Complex and Turbulent Flows
Workshop Organizers: Peter Constantin (Chicago), Charlie Doering (Michigan), Peter
Kramer (RPI), Dave Sharp (Los Alamos), Bill Young (Scripps Institute of
Oceanography)
Date: Early Spring 2010
Description: Among the most prominent physical features of turbulence are its enhanced
mixing and momentum transport properties. The concepts of eddy diffusion and eddy
viscosity, for example, are introduced as attempts to “parameterize” these effects to
produce reduced models for both theoretical analysis and simulations. At the same time
turbulent mixing and transport is the focus of significant attention from a fundamental
point of view, based in some cases on the Navier-Stokes equations and in other cases
starting from models or special flows amenable to more thorough analytical
investigations. This workshop is concerned with modern mathematical approaches to the
study of transport and mixing in turbulence and other complex flows, including
transitional flows, along with motivating applications from the applied sciences,
predominantly geophysics.
Geophysical fluid dynamics provides striking examples of both mixing and non-mixing
by complex turbulent flows. The barrier effect at the edge of the polar vortex in the
stratosphere is well-studied example of impeded transport with important practical
consequences. The deliberate release of iron fertilizer in the upper ocean in order to
trigger massive plankton blooms is example application of geophysical mixing. The
geophysical component of the workshop will focus on the mechanics of mixing in
atmospheric and oceanic flows characterized by strong rotation and stratification. These
dynamical constraints suppress vertical motion so that turbulence is both anisotropic and
structured. Chaotic advection, finite-time Lyapunov exponents, and numerical simulation
have been useful for understanding mixing and transport in these circumstances. More
recent work has focused on tracer-age and transit time densities as key concepts. Some
of the introductory lectures prior to the workshop will cover these basic topics.
The workshop will include discussions of Lagrangian approaches and stochastic models
to turbulent transport, which can handle certain anomalies more simply than the
traditional Eulerian framework. Somer talks will focus on rigorous mathematical results
on the coarse-grained behavior of the concentration field in certain flow models; these
serve as launching points for the asymptotic and analytic study of the dependence of
transport and mixing on flow parameters and inform coarse-grained approximation
approaches in more complex situations than can be treated within a completely analytical
framework. The role of particle inertia in and transport and mixing properties will also
be addressed, as will issues of parameter estimation for coarse-grained transport models.
A few talks will address special issues of mixing and transport in porous media, where
the flow can be taken as steady but generally with multiphase, multiscale, and disordered
characteristics.
Tutorial lectures will review some key phenomena in mixing, turbulent momentum
transport, turbulent energy dissipation and turbulent diffusion that can be elucidated
through analysis of both deterministic and stochastic mathematical models. Kinematic
flow models generally simplify or idealize some aspect of the flow to permit detailed
investigation of how some other complex features of the flow influence the mixing and
transport of an immersed passive scalar field. Among the turbulent diffusion phenomena
to be explored are the dependence of effective transport rates on underlying physical flow
parameters, the structure and suitability of various coarse-grained approximations for the
concentration field, and anomalies in the statistics of concentration fluctuations. Basic
results and intuition regarding these topics can be developed through the use of
multiscale and stochastic analytical techniques along with simulations of mathematical
model flows with simplified spatial and/or temporal statistical structure.
Potential participants (random order):
Annalisa Griffa (University of Miami)
Andrew Reynolds (Rothamsted Research)
Antonio Celani (Nice)
Andrea Mazzino (Genoa)
Andrew Stuart (Warwick)
Grigorios Pavliotis (Imperial)
Angelo Vulpiani (Roma 'La Sapienza')
Albert Fannjiang (UC Davis)
Tomasz Komorowksi (Maria Curie Sklodowska)
Gedeon Dagan (Tel Aviv)
Leonid Piterbarg (USC)
Louis Durlofsky (Stanford)
Jeffrey Weiss (Colorado)
Jerry Gollub (Haverford)
J. Christos Vassilicos (Imperial)
Claudia Pasquero (Irvine)
Ray Pierrehumbert (Chicago)
Eli Tziperman (Harvard)
Francois Primeau (Irvine)
Esteban Tabak (NYU)
Ed Ott (Maryland)
Stefan Llewellyn Smith (UCSD)
Jacques Vanneste (Edinburgh)
Peter Haynes (Cambridge)
Neil Balmforth (UBC)
Jean-Luc Thiffeault (Wisconsin)
Tom Haine (Johns Hopkins)
Mark Holzer (UBC)
Gautam Iyer (Stanford)
Alex Kiselev (Wisconsin)
Lenya Ryzhik (Chicago)
Alex Novikov (Penn State)
Andrej Zlatos (Chicago)
Grisha Falkovich (Weizmann)
Leslie Smith (Wisconsin)
Juan Restrepo (Arizona)
Fabian Waleffe (Wisconsin)
Norman Lebowitz (Chicago)
Divakar Viswanath (Michigan)
Parvis Moin (Stanford)
George Papanicolau (Stanford)
Paola Cessi (UCSD/Scripps)
Colm Caulfield (Cambridge)
Greg Chini (New Hampshire)
Bruno Eckhardt (Marburg)
Rich Kerswell (Bristol)
Igor Mezic (Sanna Babba)
Paul Milewski (Wisconsin)
Rich McLaughlin (Chapel Hill)
Antonello Provenzalle (Torino)
Joerg Schumacher (Ilmenau)
Ed Spiegel (Columbia)
Xiaoming Wang (Florida State)
James Glimm (Stont Brook)
James Ottino (Northwestern)
Mischa Chertkov (Los Alamos)
Nigel Goldenfeld (Illinois)
Potential Tutorials:
Jean-Luc Thiffeault, Dynamical and topological aspects of mixing
Charlie Doering, Turbulent transport, drag and convection
Peter Kramer, Mathematical Models for Turbulent Diffusion
Bill Young, Turbulence and mixing in geophysical flows